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41 lines
1.1 KiB
C
41 lines
1.1 KiB
C
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#pragma once
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#ifndef MICROSLEEP_H
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#define MICROSLEEP_H
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#include "os.h"
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#include "inline_keywords.h"
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#if !defined(IS_WINDOWS)
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/* Make sure nanosleep gets defined even when using C89. */
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#if !defined(__USE_POSIX199309) || !__USE_POSIX199309
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#define __USE_POSIX199309 1
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#endif
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#include <time.h> /* For nanosleep() */
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#endif
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/*
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* A more widely supported alternative to usleep(), based on Sleep() in Windows
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* and nanosleep() everywhere else.
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*
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* Pauses execution for the given amount of milliseconds.
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*/
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H_INLINE void microsleep(double milliseconds)
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{
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#if defined(IS_WINDOWS)
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Sleep((DWORD)milliseconds); /* (Unfortunately truncated to a 32-bit integer.) */
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#else
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/* Technically, nanosleep() is not an ANSI function, but it is the most
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* supported precise sleeping function I can find.
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*
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* If it is really necessary, it may be possible to emulate this with some
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* hack using select() in the future if we really have to. */
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struct timespec sleepytime;
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sleepytime.tv_sec = milliseconds / 1000;
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sleepytime.tv_nsec = (milliseconds - (sleepytime.tv_sec * 1000)) * 1000000;
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nanosleep(&sleepytime, NULL);
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#endif
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}
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#endif /* MICROSLEEP_H */
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